For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

With stunningly realistic animations ... the forces driving the dramatic weather on neighboring planets and moons. NOVA: Solar System: Storm Worlds Preview Episode 2: “Strange Worlds ...

the flybys that had previously altered the giant planets' orbits to their present states recreated the solar system's current ...

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find ...

CAPE CANAVERAL, Fla. — Astronomers have discovered a rare solar system in the Milky Way that boasts six planets orbiting in perfect rhythm like a cosmic orchestra, untouched by outside forces ...

But just how realistic are these artist’s concepts ... and features like dunes can be found across the solar system, on planets, dwarf planets, and even comets. “You have to be careful with analogues, ...

For years, scientists have puzzled over how these "wide-orbit" planets ... in realistic star cluster environments. They modeled a variety of conditions, from systems like our solar system with ...

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar ...

One set of dots had matching colors and brightness. open image in gallery Is there a possible ninth planet in our solar system? Researchers say they may have found a candidate (Credit: ESO/Tom ...

Check out the rest of the series. If you were born in the last century you might have memorized that there were nine planets in our solar system, as heard in the famous Schoolhouse Rock!